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IJSRD - International Journal for Scientific Research & Development| Vol. 1, Issue 2, 2013 | ISSN (online): 2321-0613

Speciality Elastomer Paint Atul J. Shah1 Prof. G. B. Bhagchandani2 1, 2 L. D. College of Engineering, Ahmedabad, Gujarat

Abstract— The main objective of this review is to describe some of the important topics related to the use of marine and protective coatings for anti-corrosive purposes. In this context,” protective” refers to coatings for containers, off shore construction, pipe lines, pumps, steel structures, chemical equipment, bridged, storage tanks and petrochemical plants. The review aims at providing a thorough picture of state-of-the-art in anti-corrosive coatings systems. International and national legislation aiming at reducing the emission of volatile organic compounds (VOCs) have caused significant changes in the anticorrosive coating industries. An important aspect in the development of new VOC –compliant, high performance anti-corrosive coating system is a thorough knowledge of the components in anti-corrosive coatings, their interaction, their advantages and limitations as well as detailed knowledge on the failure modes of anticorrosive coatings. The different types of anticorrosive coatings are presented, and the most widely applied generic types of binders and pigments in anticorrosive coatings. I. INTRODUCTION Both organic and inorganic coatings have been widely applied for the protection of metals against corrosion. In many areas of coatings technology the fight against corrosion has made significant progress in recent years. The annual costs related to corrosion and corrosion prevention has been estimated to constitute a significant part of the gross national product in the world. Corrosion issues are clearly of great importance in modern societies. In addition to the economic costs and technological delays, corrosion can lead to structural failures that have dramatic consequences for humans and the surrounding environment. Reports on the corrosion failures of metal structure, bridges, aircrafts, automobiles, buildings, and gas pipelines are not unusual. Development of new “corrosion resistance” alloys permits operation of critical processing equipment in highly corrosive environment over an ever wider range of conditions. Despite significant improvements in coating technologies problems continue in the long term protection of metal from aggressive environments. Although the oil and pipeline industry has developed reliable cathodic protection methods and monitoring systems that permit safe operation in difficult environment, these industries also experienced coating failures. One of the main reasons for the limited number of high performance anti-corrosive coating systems is the complexity of the coating substrate system and the no. of factors affecting the performance and service life of anti-corrosive coatings. Besides the composition of the coating, this consists of binders, pigments, solvents, extenders, and additives. The

performance and durability of anticorrosive coating depends on several different parameters, such as type of substance as well as several external environmental parameters. To perform its duty effectively, an anticorrosive coating must possess intrinsic durability, adhesion to the substrate, adequate flexibility and toughness to withstand impacts and cracking as well as maintain its appearance when subjected to stress, swell, mechanical abuse, or weathering. The coating industry is a mature industry that has been undergoing a continual change in technology throughout the last few decades. International and national legislation aimed at reducing the use of volatile organic compounds has led to significant changes in the formulation of anticorrosive coatings, which traditionally have contained a relatively large amount of organic solvents. The present trend of aiming to reduce emissions of VOCs will urge the coatings industry to develop products with high-solid contents, powder coatings, or waterborne coatings with low amounts of organic solvents. Although high-solid, inorganic, waterborne and powder coatings are becoming more frequently applied, it may be difficult to substitute solventborne organic coatings completely in harsh environments. An important aspect in the development of high performance of coatings systems for anticorrosive purposes in the marine and protective sector is a thorough knowledge and understanding of the interactions between the components in coatings. Furthermore, understanding of the fundamental physical and chemical mechanisms responsible for the failure of anticorrosive coatings during service may provide a basis for the designs of novel new coatings. In contrast to previous reviews that concern single topics the overall intension of this paper is to combine the main topics related to anticorrosive coatings technology. An introduction to the different types of anticorrosive coatings presently available, the main components in anticorrosive coatings, novel anticorrosive coating ideas and a summary of most important degradation mechanisms. II. COATING ADDITIVES Paint additives and coating additives include a wide range of materials added to polymer resins, paints and coatings and other substances to modify specific processing or end-use properties. They include insulating paint additives, powder coating additives, catalysts, wetting agents, levellers, clarifier, coupling agents, deflocculates, thinners, thickeners, anti-caking agents and other chemicals. Paint Additives and Coating Additives are available in many different forms. A wide range of paint additives, coating additives, insulating paint additives and powder coating additives

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Speciality elastomer paint (IJSRD/Vol. 1/Issue 2/2013/0014)

made from the finest quality raw materials. These products are effective in providing water resistance, corrosion resistance, heat resistance and abrasion resistance. Our paints and coatings additives are safe and environmentfriendly.

   

III. ANTI-CORROSION COATING A. Features Single pack; ready to use system (no need to mix two components)  Quick Drying at room temperature (Dries within 15 minutes)  Self-Priming (No need to apply primer)  Tough & Scratch proof  Fire Resistance – BS-163  Excellent resistance to U.V. Radiation  Resistance to Acids, Alkalies & saline atmosphere.  Stable up to 2000 oC  Available in all desired colour shades Available in ‘Heat Resistant’ & Heat Conductive grades. 

Sr. No .

pH : Neutral Density : 1.01 (+/- 0.02) at 27o C Viscosity : 24 sec. ( B-4 Cup ) at 270 oC Solid Content (By weight): o Brush Technique :45 – 50% o Spray Technique : 33 – 35 % Parameters

Epoxy

1

Base

Alkyd resin base

Epoxy base(Thermosettin g)

2

System

Single pack

Double pack

Single pack

3

Mixing

Thinning with the help of thinner necessary

Mixing of two components is very critical

Ready to use system

4

Necessity of primer

Red oxide primer necessary

Primer necessary

Selfpriming coating

5

Drying period

4-5 hours

48-96 hours

10 min. of touch dry, 24 hrs. for hard dry

6

Possibilities of adulteration

Possible

possible

Not possible

7

Acid, Alkali and Chemical resistance

No Resistance

Good Chemical resistance

Excellent acid, alkali, chemical resistance

8

U.V. Resistance

Poor

Poor

Excellent

9

Hat resistance

Poor

Poor

Stable up to 200 oC

10

Life (performance )

6 months

2-3 years

10 yrs(45 yrs highly corrosive atm.)

11

Shades

All I.S. Shades

Limited shades

All I.S.,RAL shades

12

Salt spray resistance

Nonperformance ; decorative paint

96 hours

3500 hrs.

B. Benefits   

Saves cost as compared to conventional protective paints Reduces the delivery period due to fast & short painting process. Saves Manpower & Time.

C. Advantages     

Easy to apply by Brush & conventional spray techniques. No skill manpower requirement. Quick & Convenient Considerable reduction in painting time. Applicable on Ferrous & Non-ferrous metals.

D. Applications     

Equipment Structural Steel Industrial Valves, Motors & Pumps Control Panels, Transformers Pipe Lines, Storage Tanks MS Structures, Chemical Refineries/Thermal Power Complexes

Plants/

IV. SPECIFICATIONS FOR ANTICORROSION COATING Function Polymeric based protective coating to protect Metallic Structures from Corrosion in varied climatic conditions. Self-Priming Single Component Air Drying Easy to Apply by Brush / Spray Techniques

B. Physical properties   

Form: Liquid Colour :As Desired Odour : Characteristic Solvent

Specialty Rubbers

Table 1. Comparison chart

A. Features    

AntiCorrosiv e Coatings

Syn. Enamels

Sr no. 1 2 3 4 5 6

Parameters Base Form Mixing Necessity of primer Surface preparation Application method

Powder coating (Epoxy/Polyester) Thermoplastic Powder No mixing No primer Seven tank process Needs special booth, electrostatic

Anti-Corrosive coatings Speciality rubbers Liquid Ready to use Self-priming coating One tank process Simple conventional equip.(auto app.

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Speciality elastomer paint (IJSRD/Vol. 1/Issue 2/2013/0014) gun and oven curing Huge consumption of electricity for oven curing

7

Energy requirement

8

Drying period

4-8 hrs

9

Environmental safety

Disposal of sludge is an issue

10 11 12

Acid, alkali and Chemical resistance U.V resistance Heat resistance

possible)

V. CONCLUSION

Minimum requirement of electricity 10 min. at room temp. Environmental friendly formulation and application

As a technology, Anti corrosive rubber coating are alive and well. Their success as a corrosion mitigation system, due in no small part to their excellent chemical resistance and ease of use has lead to a steadily increasing global market share, which continues to grow. Anti-corrosive rubber coatings, either as a single coat, stand-alone solution or part of a multilayer coating, have consistently met the demands placed upon them in a wide variety of industrial or environmental applications. Anti-corrosive rubber coatings have a successful track record for protecting all metals, RCC, wood against corrosion all over the world—from the highly aggressive environment of the extreme conditions in the chemical, marine and water born industries. In response to the needs of these industries novel technologies have led to the development of new anti-corrosive rubber coating systems, including self-healing and priming coatings, designed to tolerate abuse on the jobsite, as well as multilayer coatings with user friendly physical and chemical properties. The desire for increased service life through corrosion control systems has driven, and will continue to drive, further advancements in anti-corrosive rubber technology.is required day to day for different industrial corrosion problems in so many different manners. After all anti-corrosive rubber coating is more suitable than different industrial coatings available in market in respect of labour saving, material saving, quick setting and drying time, self-priming and better storage life with minimum coating thickness.

Moderate

Excellent

Poor 120 oC max. Not good for outdoor applications.

Excellent Stable up to 200 oC

13

Life (performance)

14

Finish

One type of finish

15

Shades Salt spray resistance

Limited

Gloss, matt, textured finish All RAL & IS

300 hrs

1500 hrs

Touch up/Refinishing not possible

Touch up/over coating possible

-

Resistance to fire

-

Saves electricity, time, manpower and enhances production

16 17

In case of damage

18

Additional features

19

Cost savings

Excellent indoor & outdoor performance

Table 2. Powder v/s anti corrosive coating C. Application properties        

Touch Dry 15 minutes Recoatable 20 minutes Hard Dry 24 hours Coverage 70 sq. ft. per litre per coat( Flat Area) Dry Film Thickness 35-40 microns / per coat – Spray Application 55-60 microns/per coat – Brush Application Application Method Conventional Spray/ Brush Technique Surface Requirement Free from dust, rust, oil, grease & any other Foreign Deposits.

D. Performance properties            

Flexibility (Conical Mandrel) 4mm: No Film Crack Impact ( 60 Kg/Cm 2): No Film Crack Adhesion Passes Gt 0 Scratch Resistance: 4.5 kg Thermal Stability 1800 oC ( Continuous) Immersion in cold water for 7 days : No Effect Observed Immersion in Boiling water for 24 hours : No Effect Observed Immersion in Lubricating Oil for 7 days : No Effect Observed Immersion in Vegetable Oil for 7 Days : No Effect Observed Immersion in Kerosene : No Effect Observed Salt Spray Resistance 1500 hours : No corrosion Exposure to mix. Of 20% HCL & 18% H 2So4: No Deterioration of film

REFERENCES [1] Picciotti, M., Picciotti, F., “Selecting CorrosionResistant Materials.” Chem. Eng. Prog., 102 (2006), 45 [2] Fragata, F., Salai, R.P., Amorin, C., Almeida, E., (2006) “Compatibility and Incompatibility in Anticorrosive Painting - The Particular Case of Maintenance Painting.” Prog. Org. Coat., 56: 257 [3] Uniroyal co., United State of America [4] [5] Shipilov, S.A., Le May, I., “Structural Integrity of Aging Buried Pipelines Having Cathodic Protection.”, 13, (2006), 1159. doi:10.1016/j.engfailanal.2005.07.008 [6] Kouloumbi, N., Ghivalos, L.G., Pantazopoulou, P., “Determination of the Performance of Epoxy Coatings Containing Feldspar Filler.” Pigment & Resin Technology, 34, (2005), 148 [7] Dabral, M., Francis, L.F., Scriven, L.E., “Drying Process Paths of Ternary Polymer Solution Coating.” AlChE J., 48, (2002), 25 [8] Almeida, E., “Surface Treatments and Coatings for Metals. A General Overview.” Ind. Eng. Chem. Res., 40, (2001), 3. doi:10.1021/ie000209l [9] Elsner, C.I., Cavalcanti, E., Ferraz, O., Di Sarli, A. R., “Evaluation of the Surface Treatment Effect on the Anticorrosive Performance of Paint Systems on Steel.” Prog. Org. Coat., 48, (2003), 50 [10] Santagata, D.M., Sere, P.R., Elsner, C.I., Di Sarli, A. R., “Evaluation of the Surface Treatment Effect on the Corrosion Performance of Paint Coated Carbon Steel.” Prog. Org. Coat., 33, (1998), 44

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Speciality elastomer paint (IJSRD/Vol. 1/Issue 2/2013/0014)

[11] Narayanan, T. N. S., “Surface Pretreatment by Phosphate Conversion Coatings - A Review.” Rev. Adv. Mater. Sci., 9, (2005), 130 [12] Nguyen, T., Hubbard, J.B., McFadden, G.B., “Mathematical Model for the Cathodic Blistering of Organic Coatings on Steel Immersed in Electrolytes.” J. Protect. Coat. Linings, 63, (1991), 43 [13] Weiss, K.D., “Paint and Coatings: A Mature Industry in Transition.” Prog. Polym. Sci., 22, (1997), 203. doi:10.1016/S0079-6700(96)00019-6 [14] Greenfield, D, Scantlebury, D, “The Protective Action of Organic Coatings on Steel: A Review.” J. Corros. Sci. Eng., 2 (2000) [15] Walter, G.W., “A Critical Review of the Protection of Metals by Paints.” Corros. Sci., 16, (1986), 39. doi:10.1016/0010-938X(86)90121-6 [16] Chemical Publishing co. Inc., Michael and Irene Ash, New York [17] Bayer Germany

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Speciality Elastomer Paint  

The main objective of this review is to describe some of the important topics related to the use of marine and protective coatings for anti-...

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